What's fun about the drive is that it is a competition - you get sorted into one of the four Hogwarts houses, tally up the points based on how many books you send and what the value is per book, and add that into your House's point pool. Whichever House wins gets the House Cup. I've participated in the past and it was quite fun and fulfilling knowing that I was helping build something out of nothing.
If you are interested, feel free to visit this webpage (http://www.thehpalliance.org/accio_books) to learn more and get the address of the school in question. The drive starts on April 6th, so there is plenty of time to gather some books that are collecting dust and send them to a school in need.